import pytest
import plakativ
import tempfile
import fitz
import fitz.utils
import os
import pdfrw


def mm_to_pt(length):
    return (72.0 * length) / 25.4


def _create_pdf(width, height):
    return tmpfile


@pytest.fixture(scope="module")
def infile_a4_portrait():
    tmpfile = _create_pdf(mm_to_pt(210), mm_to_pt(297))
    yield tmpfile
    os.unlink(tmpfile)


@pytest.fixture(scope="module")
def infile_custom_portrait():
    tmpfile = _create_pdf(mm_to_pt(200), mm_to_pt(400))
    yield tmpfile
    os.unlink(tmpfile)


@pytest.fixture(scope="module")
def infile_a4_landscape():
    tmpfile = _create_pdf(mm_to_pt(297), mm_to_pt(210))
    yield tmpfile
    os.unlink(tmpfile)


@pytest.fixture(scope="module")
def infile_custom_landscape():
    tmpfile = _create_pdf(mm_to_pt(400), mm_to_pt(200))
    yield tmpfile
    os.unlink(tmpfile)


@pytest.fixture(scope="module")
def infile_custom_square():
    tmpfile = _create_pdf(mm_to_pt(300), mm_to_pt(300))
    yield tmpfile
    os.unlink(tmpfile)


_formats = {
    "dina4_portrait": (210, 297),
    "dina4_landscape": (297, 210),
    "dina3_portrait": (297, 420),
    "dina3_landscape": (420, 297),
}


@pytest.mark.parametrize(
    "postersize,input_pagesize,output_pagesize,expected",
    [
        (
            _formats["dina3_portrait"],
            _formats["dina4_portrait"],
            None,
            [
                (
                    ["0", "380.8549", "337.72779", "841.8898"],
                    ["1.4141413", "0", "0", "1.4141413", "117.68077", "-538.5826"],
                ),
                (
                    ["257.5478", "380.8549", "595.2756", "841.8898"],
                    ["1.4141413", "0", "0", "1.4141413", "-364.20893", "-538.5826"],
                ),
                (
                    ["0", "0", "337.72779", "461.03489"],
                    ["1.4141413", "0", "0", "1.4141413", "117.68077", "189.9213"],
                ),
                (
                    ["257.5478", "0", "595.2756", "461.03489"],
                    ["1.4141413", "0", "0", "1.4141413", "-364.20893", "189.9213"],
                ),
            ],
        ),
        (
            _formats["dina3_landscape"],
            _formats["dina4_landscape"],
            None,
            [
                (
                    ["0", "257.5478", "461.03489", "595.2756"],
                    ["1.4141413", "0", "0", "1.4141413", "189.9213", "-364.20893"],
                ),
                (
                    ["380.8549", "257.5478", "841.8898", "595.2756"],
                    ["1.4141413", "0", "0", "1.4141413", "-538.5826", "-364.20893"],
                ),
                (
                    ["0", "0", "461.03489", "337.72779"],
                    ["1.4141413", "0", "0", "1.4141413", "189.9213", "117.68074"],
                ),
                (
                    ["380.8549", "0", "841.8898", "337.72779"],
                    ["1.4141413", "0", "0", "1.4141413", "-538.5826", "117.68074"],
                ),
            ],
        ),
    ],
)
def test_cases(postersize, input_pagesize, output_pagesize, expected):
    width = mm_to_pt(input_pagesize[0])
    height = mm_to_pt(input_pagesize[1])

    doc = fitz.open()
    page = doc.newPage(pno=-1, width=width, height=height)
    img = page.newShape()

    red = fitz.utils.getColor("red")
    green = fitz.utils.getColor("green")
    blue = fitz.utils.getColor("blue")
    orange = fitz.utils.getColor("orange")

    img.insertText(fitz.Point(97, 620), "A", fontsize=600, color=blue)
    img.commit()
    img.drawLine(fitz.Point(0, 0), fitz.Point(width, height))
    img.finish(color=red)
    img.drawLine(fitz.Point(0, height), fitz.Point(width, 0))
    img.finish(color=green)
    img.drawRect(fitz.Rect(fitz.Point(0, 0), fitz.Point(width, height)))
    img.finish(color=orange)
    img.commit()

    fd, infile = tempfile.mkstemp(
        prefix="plakativ", suffix="%f_%f.pdf" % (width, height)
    )
    os.close(fd)
    doc.save(infile, pretty=True, expand=255)

    fd, outfile = tempfile.mkstemp(prefix="plakativ")
    os.close(fd)
    plakativ.compute_layout(infile, outfile, mode="size", size=postersize, border=(20, 20, 20, 20))
    os.unlink(infile)

    reader = pdfrw.PdfReader(outfile)
    os.unlink(outfile)

    pages = reader.Root.Pages.Kids
    assert len(pages) == len(expected)

    for page, (bbox, matrix) in zip(pages, expected):
        assert page.Resources.XObject.fzFrm0.BBox == bbox
        assert page.Resources.XObject.fzFrm0.Matrix == matrix